.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header-container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 5px;
  border-radius: 6px;
}

.header-logo:hover {
  background: rgba(255, 255, 255, 0.1);
}

.logo-icon {
  font-size: 24px;
}

.logo-text {
  font-size: 20px;
  font-weight: 600;
  color: white;
}

.header-nav {
  display: flex;
  gap: 5px;
}

.nav-item {
  padding: 8px 16px;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.nav-item.active {
  background: rgba(0, 255, 255, 0.2);
  color: #00ffff;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

/* User Menu */
.user-menu {
  position: relative;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00ffff, #0080ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 255, 255, 0.3);
}

.user-avatar:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 255, 255, 0.5);
}

.user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 10px;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 15px;
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  z-index: 1001;
}

.user-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-info {
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.user-name {
  color: #00ffff;
  font-weight: bold;
  margin-bottom: 5px;
}

.user-email {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.dropdown-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: 10px 0;
}

.dropdown-item {
  width: 100%;
  padding: 8px 12px;
  background: transparent;
  border: none;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.dropdown-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.logout-btn {
  color: #ff4336;
}

.logout-btn:hover {
  background: rgba(255, 67, 54, 0.1);
}

.login-btn {
  padding: 8px 16px;
  background: linear-gradient(135deg, #00ffff, #0080ff);
  border: none;
  border-radius: 6px;
  color: white;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.login-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 255, 255, 0.3);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 30px;
  height: 30px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger {
  width: 20px;
  height: 2px;
  background: white;
  position: relative;
  transition: all 0.3s ease;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 2px;
  background: white;
  transition: all 0.3s ease;
}

.hamburger::before {
  top: -6px;
}

.hamburger::after {
  top: 6px;
}

.hamburger.open {
  background: transparent;
}

.hamburger.open::before {
  top: 0;
  transform: rotate(45deg);
}

.hamburger.open::after {
  top: 0;
  transform: rotate(-45deg);
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-container {
    padding: 0 15px;
  }
  
  .header-nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: 20px;
    gap: 10px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
  }
  
  .header-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-item {
    width: 100%;
    padding: 12px 16px;
    text-align: center;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .user-dropdown {
    right: -10px;
  }
}

@media (max-width: 480px) {
  .header-container {
    padding: 0 10px;
  }
  
  .logo-text {
    font-size: 18px;
  }
  
  .header-actions {
    gap: 10px;
  }
}